This was called Bone Music, and a black market of bone smuggling soon spread through Russia. A December 2015 99% Invisible podcast tells the story of how dissident kitchens became night clubs and how the KGB's cracked down on the "ribs" by flooding the market with fakes.
I just think these records are stunningly beautiful, and can only imagine how creepy the skeletons must look when dancing around a turntable.
For years, I've had the idea to take the large x-rays I have of my own spine, and to turn it into a lampshade. Having now discovered bone music, I think I will move that project to the top of my summer DIY list.
*A discovery that would later land him in a Siberian prison for 5 year.